LM123QML LM123QML 3-Amp, 5-Volt Positive Regulator Literature Number: SNVS393 LM123QML 3-Amp, 5-Volt Positive Regulator General Description The LM123 is a three-terminal positive regulator with a preset 5V output and a load driving capability of 3 amps. New circuit design and processing techniques are used to provide the high output current without sacrificing the regulation characteristics of lower current devices. The 3 amp regulator is virtually blowout proof. Current limiting, power limiting, and thermal shutdown provide the same high level of reliability obtained with these techniques in the LM109 1 amp regulator. No external components are required for operation of the LM123. If the device is more than 4 inches from the filter capacitor, however, a 1 μF solid tantalum capacitor should be used on the input. A 0.1 μF or larger capacitor may be used on the output to reduce load transient spikes created by fast switching digital logic, or to swamp out stray load capacitance. An overall worst case specification for the combined effects of input voltage, load currents, ambient temperature, and power dissipation ensure that the LM123 will perform satisfactorily as a system element. For applications requiring other voltages, see LM150 series adjustable regulator data sheet. Features ■ ■ ■ ■ ■ 3 amp output current Internal current and thermal limiting 0.01Ω typical output impedance 7.5V minimum input voltage 30W power dissipation Ordering Information NS Part Number SMD Part Number NS Package Number Package Description K02C 2LD T0-3 Metal Can LM123K/883 Connection Diagram Metal Can Package 20159302 See NS Package Number K02C © 2010 National Semiconductor Corporation 201593 www.national.com LM123QML 3-Amp, 5-Volt Positive Regulator December 16, 2010 LM123QML Schematic Diagram 20159301 www.national.com 2 LM123QML Absolute Maximum Ratings (Note 1) Input Voltage Power Dissipation (Note 2) Operating Junction Temperature Range 20V Internally Limited −55°C ≤ TJ ≤ +150°C −65°C ≤ TJ ≤ +150°C 300°C 2000V Storage Temperature Range Lead Temperature (Soldering, 10 sec.) ESD Tolerance (Note 3) Quality Conformance Inspection Mil-Std-883, Method 5005 - Group A Subgroup Description Temp (°C) 1 Static tests at +25 2 Static tests at +125 3 Static tests at -55 4 Dynamic tests at +25 5 Dynamic tests at +125 6 Dynamic tests at -55 7 Functional tests at +25 8A Functional tests at +125 8B Functional tests at -55 9 Switching tests at +25 10 Switching tests at +125 11 Switching tests at -55 12 Settling time at +25 13 Settling time at +125 14 Settling time at -55 DC Parameters Symbol Min Max Units Subgroups 4.7 5.3 V 1 0 ≤ IO ≤ 3A, P ≤ 30W 4.6 5.4 V 1, 2, 3 Parameter Conditions Notes VIN = 7.5V, IO = 0A VOUT Output Voltage 7.5V ≤ VIN ≤ 15V, VRLine Line Regulation 7.5V ≤ VIN ≤ 15V, IO = 0A -25 25 mV 1 VRLoad Load Regulation VIN = 7.5V, 0 ≤ IO ≤ 3A -100 100 mV 1 IQ Quiescent Current VIN = 15V, 0 ≤ IO ≤ 3A 20 mA 1, 2, 3 VIN = 7.5V, 0 ≤ IO ≤ 3A 20 mA 1, 2, 3 ISC Short Circuit Current VIN = 15V 4.5 A 1 VIN =7.5V 5.0 A 1 ΔVO / ΔT Long Term Stability 35 mV 1 (Note 4) Note 1: Absolute Maximum Ratings indicate limits beyond which damage to the device may occur. Operating Ratings indicate conditions for which the device is functional, but do not guarantee specific performance limits. For guaranteed specifications and test conditions, see the Electrical Characteristics. The guaranteed specifications apply only for the test conditions listed. Some performance characteristics may degrade when the device is not operated under the listed test conditions. Note 2: The maximum power dissipation must be derated at elevated temperatures and is dictated by TJmax (maximum junction temperature), θJA (package junction to ambient thermal resistance), and TA (ambient temperature). The maximum allowable power dissipation at any temperature is PDmax = (TJmax - TA)/ θJA or the number given in the Absolute Maximum Ratings, whichever is lower. Note 3: Human body model, 1.5 kΩ in series with 100 pF. Note 4: Guaranteed parameter not tested. 3 www.national.com LM123QML Typical Performance Characteristics Maximum Average Power Dissipation for LM123 Output Impedance 20159311 20159309 Peak Available Output Current Short Circuit Current 20159313 20159312 Ripple Rejection Dropout Voltage 20159314 www.national.com 20159315 4 LM123QML Line Transient Response Output Voltage 20159316 20159317 Quiescent Current Load Transient Response 20159318 20159319 Output Noise Voltage 20159320 5 www.national.com LM123QML Typical Applications 10 Amp Regulator with Complete Overload Protection 20159306 *Select for 20 mA Current from Unregulated Negative Supply www.national.com 6 LM123QML Adjustable Regulator 0V−10V @ 3A 20159307 A1—LM101A C1—2 μF Optional—Improves Ripple Rejection, Noise, and Transient Response Trimming Output to 5V 20159308 Adjustable Output 5V−10V 0.1% Regulation 20159304 *Select to Set Output Voltage **Select to Draw 25 mA from V− 7 www.national.com LM123QML Basic 3 Amp Regulator 20159303 *Required if LM123 is more than 4″ from filter capacitor. †Regulator is stable with no load capacitor into resistive loads. www.national.com 8 Released Revision 12/16/2010 A Section Changes New Release, Corporate format 9 1 MDS data sheet converted into one Corp. data sheet format. The drift table was eliminated from the 883 section since it did not apply; MNLM123-X Rev 0BL will be archived. www.national.com LM123QML Revision History Section LM123QML Physical Dimensions inches (millimeters) unless otherwise noted Metal Can Package (K) NS Package Number K02C www.national.com 10 LM123QML Notes 11 www.national.com LM123QML 3-Amp, 5-Volt Positive Regulator Notes For more National Semiconductor product information and proven design tools, visit the following Web sites at: www.national.com Products Design Support Amplifiers www.national.com/amplifiers WEBENCH® Tools www.national.com/webench Audio www.national.com/audio App Notes www.national.com/appnotes Clock and Timing www.national.com/timing Reference Designs www.national.com/refdesigns Data Converters www.national.com/adc Samples www.national.com/samples Interface www.national.com/interface Eval Boards www.national.com/evalboards LVDS www.national.com/lvds Packaging www.national.com/packaging Power Management www.national.com/power Green Compliance www.national.com/quality/green Switching Regulators www.national.com/switchers Distributors www.national.com/contacts LDOs www.national.com/ldo Quality and Reliability www.national.com/quality LED Lighting www.national.com/led Feedback/Support www.national.com/feedback Voltage References www.national.com/vref Design Made Easy www.national.com/easy www.national.com/powerwise Applications & Markets www.national.com/solutions Mil/Aero www.national.com/milaero PowerWise® Solutions Serial Digital Interface (SDI) www.national.com/sdi Temperature Sensors www.national.com/tempsensors SolarMagic™ www.national.com/solarmagic PLL/VCO www.national.com/wireless www.national.com/training PowerWise® Design University THE CONTENTS OF THIS DOCUMENT ARE PROVIDED IN CONNECTION WITH NATIONAL SEMICONDUCTOR CORPORATION (“NATIONAL”) PRODUCTS. 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